Properly join paths for error frame.

Author: vladfi1

phillip/RL.py

@@ -245,7 +245,7 @@ def train(self, experiences, batch_steps=1, train=True, log=True, **kwargs):
         results = self.sess.run(run_dict, input_dict)
       except tf.errors.InvalidArgumentError as e:
         import pickle
-        with open(self.path + 'error', 'wb') as f:
+        with open(os.join(self.path, 'error_frame'), 'wb') as f:
           pickle.dump(experiences, f)
         raise e
       #print('After run: %s' % resource.getrusage(resource.RUSAGE_SELF).ru_maxrss)